Iwan lost his grandmother to Alzheimer’s disease and vascular dementia in 2008. He said: “My grandmother was a real pillar of the community in Llanrug, North Wales. She was a Sunday school teacher and a dinner lady in a primary school. She was an incredibly strong woman and wouldn’t take any rubbish from anyone, so to see her go from that to like a scared child was really tough. It all happened so quickly, and got to the point where she couldn’t live by herself anymore and unfortunately she had to be sectioned. At times she would become really confused, thinking I was her husband. At first it was kind of funny – you have to try and laugh through these things – but she eventually deteriorated to the point she didn’t know who we were or where she was. It was pretty hardcore. I’ll always remember the way she used to constantly chase me and my brother around as we’d always be up to mischief. Even though we were a bit of a nightmare, she loved having the family around. She was a lovely woman. I’m proud to have played a small part in the project, and hope people will share this animation as far and wide as possible to improve understanding of this devastating condition."
Source 1, 2, 3 (wouldn't embed, so I uploaded it to YT)